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Syphilis
Syphilis Possible therapeutic alternatives
Syphilis (early)
Less than one year. Primary: ulcer or chancre at site of infection. Secondary: rash, mucocutaneous lesions, adenopathy.		 T. pallidum
Benzathine Penicillin G   2.4mu IM x 1 (if pregnant-repeat therapy after 1 week).
Alternatives:
Doxycycline 100mg twice daily for 2 weeks  or
Tetracycline 500mg four times daily for 2 weeks  or
Ceftriaxone 125mg IM  once daily for 10 days or 250mg  IM every other day x 5 doses. 
Azithromycin 2 grams PO x 1.
Syphilis (late, or greater than one year duration) Tertiary (late): cardiac, neurologic, ophthalmic, auditory or gummatous lesions. T. pallidum
Benzathine Penicillin G 2.4 million units IM weekly x 3 doses
Penicillin allergic patients
Doxycycline 100mg twice daily for 28 days or tetracycline 500mg orally four times daily for 28 days. 
Neurosyphilis T. pallidum
Penicillin G  3 to 4 million units q4h IV for 10-14 days or 
Ampicillin 4 grams IVPB every 6 hours for 10 to 14 days. // Desensitize penicillin allergic patients.
Procaine penicillin 2.4 million units IM qd, +  probenecid 500 mg PO qid x 10-14 days

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Secondary Syphilis

References - Infectious Disease Section
Infectious Disease References

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